Magnetotransport of manganite superlattices: Investigating the role of a magnetic insulating spacer

Niebieskikwiat, D.; Hueso, L. E.; Mathur, N. D.; Salamon, M. B.
September 2008
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p123120
Academic Journal
Magnetotransport data are presented for a set of manganite superlattices comprising La2/3Sr1/3MnO3 as the ferromagnetic (FM) metallic layers (thickness 11.9 nm) and Pr2/3Ca1/3MnO3 as the antiferromagnetic insulating spacer (IS) with thicknesses tIS between 0.8 and 7.6 nm. Previous studies on this system showed the presence of FM inclusions within the IS, with a notable magnetization peak at tIS∼3 nm. Now, we show that this peak is also accompanied by a maximum in the magnetoresistance (MR). Moreover, the MR data of all the samples scale in a single curve, MR∝MIS2, where MIS is the magnetization of the IS. These results provide a quantitative demonstration of the feasibility to improve the response of engineered MR devices by including magnetically active IS instead of the usual nonmagnetic compounds.


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